C/O Spring - 4.125ID x 11 250#

The C/O Spring - 4.125ID x 11 250# from QA1 is a high-performance coil spring designed for serious suspension builders and performance mechanics who demand precision control over vehicle dynamics. This spring is engineered to work within modern suspension geometry tuning, allowing for fine-tuning of ride height, spring rate, and load distribution without compromising handling characteristics.

Built to QA1's exacting standards, the C/O Spring features a 4.125-inch inner diameter with an 11-inch free length and a 250-pound spring rate—specifications that contribute to controlled body roll and predictable weight transfer. QA1's manufacturing process ensures consistent coil spacing and dimensional accuracy across every unit, eliminating issues like spring bind that can result from inferior parts.

This spring excels in independent rear suspension systems and custom double-A-arm applications where precise spring rate matching is critical to chassis tuning. Mechanics and enthusiasts building street performance cars or upgrading older vehicles will find this spring provides the consistency and durability required for repeatable results.